Patents by Inventor Douglas Marden Chapman

Douglas Marden Chapman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Load cell device for aircraft waste measurement
    Patent number: 6360617
    Abstract: A load cell assembly for use in measuring the level of a liquid in an airplane waste tank includes a lower member, a spherical bearing placed in the lower member, an upper member, in contact with the spherical bearing, and a fastener to couple the lower member, spherical bearing and upper member together, the lower member having pockets formed therein and including a strain gauge device within each of the pockets.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: March 26, 2002
    Assignee: Kaiser Electroprecision
    Inventor: Douglas Marden Chapman